How do you start a dead PSP?

Could you elaborate on the meaning of "dead PSP" in this context? Assuming it refers to a defunct or unresponsive Portable Sony PlayStation (PSP) console, here's a possible description posed as a question: "If you're faced with a seemingly unresponsive or dead PSP console, how would you go about attempting to revive it? Are there any troubleshooting steps one could take, such as checking the battery, performing a reset, or attempting to recharge the device? Or are there any specific repair procedures that might be necessary to address hardware issues that could be causing the console to malfunction?